How many of the given organisms exhibit radial symmetry?
(a) Pleurobrachia
(b) Adamsia
(c) Aurelia
(d) Ctenoplana
(e) Aedes
(f) Taenia
Choose the correct option
Solution:
Radial symmetry is a form of symmetry in which the body parts are arranged around a central axis. Organisms exhibiting radial symmetry can be divided into two equal halves by any plane passing through the central axis. Let's examine the given organisms:
(a) Pleurobrachia: Belongs to Ctenophora (comb jellies), which exhibit radial symmetry.
(b) Adamsia: A sea anemone, belongs to Cnidaria, which exhibit radial symmetry.
(c) Aurelia: A jellyfish, belongs to Cnidaria, which exhibit radial symmetry.
(d) Ctenoplana: Belongs to Ctenophora, which exhibit radial symmetry.
(e) Aedes: A mosquito, belongs to Arthropoda, which exhibit bilateral symmetry.
(f) Taenia: A tapeworm, belongs to Platyhelminthes, which exhibit bilateral symmetry.
Thus, Pleurobrachia, Adamsia, Aurelia, and Ctenoplana exhibit radial symmetry. There are four such organisms.